Sludge drying machine with double air ducts

Abstract

The utility model discloses a double-air-duct sludge drying machine and belongs to the technical field of drying machines, the double-air-duct sludge drying machine comprises a box body, a supporting plate and an air supply device, a drying chamber is arranged in the center of the box body, two cooling chambers are arranged on the two sides of the drying chamber respectively, the drying chamber and the box body are separated through the supporting plate, and an upper conveying mesh belt and a lower conveying mesh belt are arranged in the drying chamber; two air inlets are formed in the top of the drying chamber, the two air inlets are in axial symmetry with respect to the center line of the conveying mesh belt, the two air inlets are connected with two air supply devices respectively, the two air supply devices are in axial symmetry with respect to the center line of the box body, and two filters are arranged at the bottom of the drying chamber. Sludge on the conveying mesh belt can be dried to the maximum extent through a double-air-duct structure formed by the two air supply devices, and humid water vapor formed after sludge drying is cooled and dried through the two cooling chambers and then returns to the centrifugal fan, so that two air supply and air return circulation channels are formed; the drying efficiency of the sludge is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of dryers, and in particular, relates to a sludge dryer with double air ducts. Background Art

[0002] The belt dryer usually uses centrifugal fans for air supply and return. The working principle is to use hot air to remove moisture from the sludge, and the hot and humid air is cooled and dehumidified by the surface cooler, and then heated by the heater to become dry hot air for recycling.

[0003] Patent Publication (Announcement) No.: CN103693837A discloses a sludge dryer that uses a single air duct to dry sludge. This will result in the material being drier on the side close to the centrifugal fan return air inlet during the drying process, while the material being not dry on the side away from the centrifugal fan return air inlet, resulting in the discharge being half-dry and half-wet. This requires an increase in drying time to meet the discharge moisture content standard, which will increase equipment energy consumption and reduce production capacity. Therefore, in order to increase drying efficiency, a more efficient sludge dryer needs to be designed to adapt to the production of belt-type sludge dryers. Utility Model Content

[0004] In order to solve the above problems, the present application proposes a dual-air duct sludge dryer.

[0005] The purpose of the present application is to provide a dual-duct sludge dryer. The dual-duct structure formed by two air supply devices can dry the sludge on the conveyor belt to the greatest extent, and the moist water vapor formed after the sludge is dried is returned to the centrifugal fan after cooling and drying in two cooling chambers, thus forming two circulation channels for air supply and return air, thereby improving the sludge drying efficiency.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] A dual-duct sludge drying machine comprises: a box body, a support plate and an air supply device, a drying chamber is provided in the center of the box body, two cooling chambers are provided on both sides of the drying chamber, the drying chamber is separated from the box body by a support plate, an upper and lower conveying mesh belt is provided in the drying chamber, two air inlets are provided on the top of the drying chamber, the two air inlets are axially symmetrical with respect to the center line of the conveying mesh belt, the two air inlets are respectively connected to two air supply devices, the two air supply devices are axially symmetrical with respect to the center line of the box body, the air supply device heats the air in the cooling chamber and then supplies it to the drying chamber, two filters are provided at the bottom of the drying chamber, the two filters are respectively connected to the two cooling chambers on both sides of the drying chamber.

[0008] Furthermore, two return air inclined plates are provided below the conveyor mesh belt, and the two return air inclined plates are axially symmetrical with respect to the center line of the conveyor mesh belt.

[0009] Furthermore, the return air inclined plate includes: a right-angled triangle bracket and an air permeable plate, the hypotenuse of the right-angled triangle bracket is fixedly connected to the air permeable plate, the air permeable plate faces the conveyor belt, the two right-angled sides of the right-angled triangle bracket are respectively fixedly connected to the bottom surface of the box and the support plate, and the side of the triangle bracket close to the support plate is connected to the filter.

[0010] Furthermore, the air-permeable plate is a rectangular plate, a plurality of air holes are arranged on the rectangular plate, and the plurality of air-permeable holes are evenly distributed on the rectangular plate. Connecting ears are arranged on both sides of the rectangular plate, mounting holes are arranged on the connecting ears, and bolts pass through the mounting holes to be fixedly connected to the right-angled triangle bracket.

[0011] Furthermore, the air supply device includes: a centrifugal fan, a fan volute, an air supply pipe, a metal corrugated hose, an air supply hood, a mesh flow equalizing plate and a heater, the centrifugal fan is located at the top of the box, the centrifugal fan is connected to the fan volute, the air outlet of the fan volute is connected to the air supply pipe, the end of the air supply pipe away from the fan volute is connected through a metal corrugated hose, the end of the corrugated hose away from the air supply pipe is connected to the air supply hood, the air supply hood and the heater are connected through a mesh flow equalizing plate, and the end of the heater away from the air supply hood is connected to the air inlet.

[0012] Furthermore, the air supply hood is a rectangular parallelepiped, a circular through hole is provided on one side of the air supply hood, the circular through hole is connected to the metal corrugated hose, the length of the air supply hood is smaller than the length of the conveyor mesh belt, and the width of the air supply hood is smaller than half the width of the conveyor mesh belt.

[0013] Furthermore, a wind partition plate is provided on the top of the box body, and the two cooling chambers are separated by the wind partition plate.

[0014] Furthermore, the air flow direction of the air inlet is perpendicular to the conveyor belt, and the sum of the widths of the two air inlets is smaller than the width of the conveyor belt.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] 1. The double air duct structure formed by two air supply devices in the present application can dry the sludge on the conveyor mesh belt to the greatest extent, and the moist water vapor formed after the sludge is dried is returned to the centrifugal fan after cooling and drying in two cooling chambers, thus forming two circulation channels for supply and return air, improving the sludge drying efficiency, improving the air supply uniformity of the sludge on the conveyor mesh belt, and the uniformity of return air, ensuring the uniform moisture content of the sludge after drying, and improving energy utilization and production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of this application;

[0018] Figure 2 A three-dimensional schematic diagram of the air supply hood of this application;

[0019] Figure 3 This is a three-dimensional schematic diagram of the return air inclined plate of this application;

[0020] Figure 4 A three-dimensional schematic diagram of the air permeable plate of the present application;

[0021] Figure 5 This is a three-dimensional schematic diagram of a right-angled triangle bracket of the present application;

[0022] Among them: 1. Box body, 2. Drying chamber, 3. Cooling chamber, 4. Support plate, 5. Conveyor mesh belt, 6. Return air inclined plate, 7. Filter, 8. Heater, 9. Mesh flow equalizing plate, 10. Air supply hood, 11. Metal corrugated hose, 12. Air supply pipe, 13. Fan volute, 14. Centrifugal fan, 15. Wind baffle, 16. Surface cooler, 17. Breathable plate, 18. Right-angled triangle bracket, 19. Connecting ear, 20. Air inlet. DETAILED DESCRIPTION

[0023] The present application is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0024] A double-air duct sludge dryer, such as Figure 1-5 As shown, it comprises: a box body 1, a support plate 4 and an air supply device, a drying chamber 2 is provided in the center of the box body 1, two cooling chambers 3 are provided on both sides of the drying chamber 2, the drying chamber 2 is separated from the box body 1 by a support plate 4, an upper and lower conveying mesh belt 5 is provided in the drying chamber 2, and the conveying mesh belt 5 conveys the sludge to be dried, and two air inlets 20 are provided on the top of the drying chamber 2, the two air inlets 20 are axially symmetrical with the center line of the conveying mesh belt 5, the two air inlets 20 are respectively connected to two air supply devices, the two air supply devices are axially symmetrical with the center line of the box body 1, and the air supply device adds air to the cooling chamber 3. After heating, it is transported to the drying chamber 2. Two filters 7 are provided at the bottom of the drying chamber 2. The two filters 7 are respectively connected to the two cooling chambers 3 on both sides of the drying chamber 2. The two air supply devices heat the cold air in the cooling chamber 3 to become a dry hot air flow, and transport it to the drying chamber 2. In this way, the wet sludge on the conveyor belt 5 can be more comprehensively heated, and the moisture therein can be taken out to become a moist hot air flow, which enters the cooling chamber 3 again through the filter 7 for cooling. The filters 7 on both sides adsorb the dust particles carried therein, and the cooling chamber 3 cools the moist hot air flow, thereby improving the sludge drying efficiency.

[0025] like Figure 1As shown, two return air inclined plates 6 are further provided below the conveyor mesh belt 5. The two return air inclined plates 6 are axially symmetrical with respect to the center line of the conveyor mesh belt 5. The return air inclined plates 6 guide the moist hot air at the bottom of the drying chamber 2 to flow toward the filter 7 respectively.

[0026] like Figure 3 As shown, the return air inclined plate 6 includes: a right-angled triangle bracket 8 and a breathable plate 17, the hypotenuse of the right-angled triangle bracket 8 is fixedly connected to the breathable plate 17, the breathable plate 17 faces the conveyor mesh belt 5, and the two right-angled sides of the right-angled triangle bracket 8 are respectively fixedly connected to the bottom surface of the box body 1 and the support plate 4, and the side of the triangular bracket 8 close to the support plate 4 is connected to the filter 7, so that the moist airflow passing through the conveyor mesh belt 5 is diverted through the return air inclined plate 6 and diverted to the filters 7 on both sides, so that the diversion through the return air inclined plate 6 can prevent the moist hot air from gathering at the bottom of the drying chamber 2.

[0027] like Figure 4 As shown, the air-permeable plate 17 is a rectangular plate, and a plurality of air-permeable holes are arranged on the rectangular plate, and the plurality of air-permeable holes are evenly distributed on the rectangular plate. Connecting ears 19 are arranged on both sides of the rectangular plate, and mounting holes are arranged on the connecting ears 19, and bolts pass through the mounting holes to be fixedly connected with the right-angled triangle bracket 8.

[0028] like Figure 1 As shown, the air supply device includes: a centrifugal fan 14, a fan volute 13, an air supply pipe 12, a metal corrugated hose 11, an air supply hood 10, a mesh flow equalizing plate 9 and a heater 8, wherein the centrifugal fan 14 is located at the top of the box body 1, and the centrifugal fan 14 is connected to the fan volute 13, and the air outlet of the fan volute 13 is connected to the air supply pipe 12, and the end of the air supply pipe 12 away from the fan volute 13 is connected through the metal corrugated hose 11, and the end of the corrugated hose away from the air supply pipe 12 is connected to the air supply hood 10, and the air supply hood 10 is connected to the heater 8 through the mesh flow equalizing plate 9, and the end of the heater 8 away from the air supply hood 10 is connected to the air inlet 20. The centrifugal fan 14 transports the cold air dried and cooled in the cooling chamber 3 through the fan volute 13 through the air supply pipe 12 and the metal corrugated hose 11 to the air supply hood 10. The cold air in the air supply hood 10 is dispersed by the mesh flow equalizing plate 9 and transported to the heater 8. After being heated by the heater 8, the high-temperature air is obtained and finally enters the drying chamber 2 through the air inlet 20 to dry the sludge.

[0029] like Figure 2 As shown, the air supply hood 10 is a rectangular parallelepiped, and a circular through hole is provided on one side of the air supply hood 10. The circular through hole is connected to the metal corrugated hose 11. The length of the air supply hood 10 is less than the length of the conveyor mesh belt 5, and the width of the air supply hood 10 is less than half the width of the conveyor mesh belt 5.

[0030] like Figure 1 As shown, a wind baffle 15 is further provided on the top of the box body 1 , and the two cooling chambers 3 are separated by the wind baffle 15 .

[0031] like Figure 1 As shown, the airflow direction of the air inlet 20 is perpendicular to the conveyor mesh belt 5, and the sum of the widths of the two air inlets 20 is smaller than the width of the conveyor mesh belt 5.

[0032] like Figure 1 As shown, a surface cooler 16 is provided in the cooling chamber 3, and the moist hot air flow is cooled into a dry cold air flow by the surface cooler 16.

[0033] In the technical solution of the present application, two air supply devices are arranged in the box body 1, and in the drying chamber 2, as shown in FIG. Figure 1 As shown, hot air is blown vertically from top to bottom to dry the sludge on the sludge conveying mesh belt 5 in the drying chamber 2. In this way, the two air supply devices operate simultaneously to increase the drying surface area of ​​the conveying mesh belt 5, so that the sludge can be dried over a large range to prevent uneven drying of the sludge. The moist airflow is then guided by the two return air inclined plates 6 at the bottom of the drying chamber 2 to guide the moist airflow and finally transported to the cooling chamber 3 through the filter 7. In this way, the moist airflow can be prevented from gathering at the bottom of the drying chamber 2 and being unable to be discharged, thereby affecting the sludge drying.

[0034] Therefore, the double air duct structure formed by the two air supply devices in the present application can dry the sludge on the conveyor mesh belt 5 to the greatest extent, and the moist water vapor formed after the sludge is dried is returned to the centrifugal fan 14 after cooling and drying in the two cooling chambers 3, thus forming two air supply and return air channels. The two air supply devices work at the same time and do not affect each other, thereby improving the sludge drying efficiency, improving the air supply uniformity of the sludge on the conveyor mesh belt 5, and the return air uniformity, ensuring that the moisture content of the sludge after drying is uniform, and improving energy utilization and production capacity.

[0035] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application.

Claims

1. A double-duct sludge dryer, characterized in that: include: A box body, a support plate and an air supply device, a drying chamber is provided in the center of the box body, two cooling chambers are provided on both sides of the drying chamber, the drying chamber is separated from the box body by a support plate, an upper and lower conveying mesh belt is provided in the drying chamber, two air inlets are provided on the top of the drying chamber, the two air inlets are axially symmetrical with the center line of the conveying mesh belt, the two air inlets are respectively connected to two air supply devices, the two air supply devices are axially symmetrical with the center line of the box body, the air supply device heats the air in the cooling chamber and then conveys it to the drying chamber, two filters are provided at the bottom of the drying chamber, the two filters are respectively connected to the two cooling chambers on both sides of the drying chamber.

2. A double-air-duct sludge drying machine as claimed in claim 1, characterized in that: Two return air inclined plates are also provided below the conveyor mesh belt, and the two return air inclined plates are axially symmetrical with respect to the center line of the conveyor mesh belt.

3. A double-duct sludge drying machine as claimed in claim 2, characterized in that: The return air inclined plate includes: a right-angled triangle bracket and an air-permeable plate, the hypotenuse of the right-angled triangle bracket is fixedly connected to the air-permeable plate, the air-permeable plate faces the conveyor belt, the two right-angled sides of the right-angled triangle bracket are respectively fixedly connected to the bottom surface of the box and the support plate, and the side of the triangle bracket close to the support plate is connected to the filter.

4. A double-duct sludge drying machine as claimed in claim 3, characterized in that: The air-permeable plate is a rectangular plate, and a plurality of air-permeable holes are arranged on the rectangular plate, and the plurality of air-permeable holes are evenly distributed on the rectangular plate. Connecting ears are arranged on both sides of the rectangular plate, and mounting holes are arranged on the connecting ears. Bolts pass through the mounting holes and are fixedly connected to the right-angled triangle bracket.

5. The double-air-duct sludge drying machine according to claim 1, characterized in that: The air supply device includes: a centrifugal fan, a fan volute, an air supply pipe, a metal corrugated hose, an air supply hood, a mesh flow equalizing plate and a heater, wherein the centrifugal fan is located at the top of the box, the centrifugal fan is connected to the fan volute, the air outlet of the fan volute is connected to the air supply pipe, the end of the air supply pipe away from the fan volute is connected through a metal corrugated hose, the end of the corrugated hose away from the air supply pipe is connected to the air supply hood, the air supply hood and the heater are connected through a mesh flow equalizing plate, and the end of the heater away from the air supply hood is connected to the air inlet.

6. A double-air-duct sludge drying machine as claimed in claim 5, characterized in that: The air supply hood is a rectangular parallelepiped, and a circular through hole is provided on one side of the air supply hood, and the circular through hole is connected to a metal corrugated hose. The length of the air supply hood is less than the length of the conveyor mesh belt, and the width of the air supply hood is less than half the width of the conveyor mesh belt.

7. The double-duct sludge drying machine according to claim 1, characterized in that: A wind partition plate is also provided on the top of the box body, and the two cooling chambers are separated by the wind partition plate.

8. The double-air-duct sludge drying machine according to claim 1, characterized in that: The air flow direction of the air inlet is perpendicular to the conveyor mesh belt, and the sum of the widths of the two air inlets is smaller than the width of the conveyor mesh belt.

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